Final Report on key comparison EURAMET.M.P K4.2020 in the range from 1 Pa to 15 kPa of absolute and gauge pressure

Main text This report presents the results of the EURAMET key comparison EURAMET.M.P-K4.2020 (EURAMET Project No. 1494), performed in the range of 1 Pa to 15 kPa of absolute and gauge pressure. Five National Metrology Institutes (NMIs), Physikalisch-Technische Bundesanstalt (PTB), Český Metrologický Institut (CMI), Institut za Kovinske Materiale in Tehnologije (IMT), Ulusal Metroloji Enstitüsü (UME), and RISE Research Institutes of Sweden AB (RISE), participated in the comparison. The comparison was realised as a direct comparison of the PTB, IMT, UME, and RISE standards with the CMI standard, transported to CMI and operated in the CMI premises. The measurements were performed in the period from September 2019 to April 2022. All participants' results obtained for absolute and gauge pressure are equivalent with the reference value of the present comparison and with each other. Being linked to the respective CCM key comparison, CCM.P-K4.2012, some results at some pressures show bigger deviations than their uncertainties, which presumably deals with the uncertainty of the link. To reach the main text of this paper, click on Final Report . Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/ . The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).